Mavs add 3 to roster as training camp approaches

Melo was a first-round pick by Boston last year and played six games for the Celtics. The 7-footer spent most of the season with Maine in the NBA Development League. He was traded to Memphis for Donte Green in August and waived by the Grizzlies two weeks later.

Kennedy helped Rio Grande Valley win the D-League championship last season. He played two games for Cleveland during the 2011-12 season and scored 12 points in his debut with the Cavaliers.